41. The degradation is more severe for the RVS spectrograph than for the astrometry measurements, and only affects the fainter stars. 42. Harris was responsible for the August 1973 IAU Symposium No . 61 in Perth on " New Problems of Astrometry ". 43. Astrometry is understood by precisely measuring delay line additions while fringing, to match the light path differences from baseline ends.44. The system's distance from the Sun as measured by the Hipparcos astrometry satellite is approximately 120 light-years. 45. The whole system lies about 83 light-years away from the Sun, as measured by the Hipparcos astrometry satellite. 46. The publication of the shape model and of astrometry based on radar observations obtained in 1999, 2005, and 2011, 47. Debehogne worked at the Royal Observatory of Belgium ( ) in Uccle, and specialized in astrometry of comets and minor planets. 48. Most of early astronomy actually consisted of mapping the positions of the stars and planets, a science now referred to as astrometry . 49. NOFS is heavily involved with the science of star catalogs and astrometry , or the positions and distances of stars and celestial objects. 50. It was the first space experiment devoted to precision astrometry , the accurate measurement of the positions of celestial objects on the sky.
